KamperBob: Thank you very much, I had some doubts about where to align the ground plane in a plan view, I had seen some done this way so that's what I followed. Thank you very much, I appreciate the input,
EDIT: Here is the updated overlay, with the ground plane aligned down the centre of the truck, and as KamperBob said, it provides more taper than the previous one. If there is still more tweaking required, let me know, I appreciate the input.